372 Annals Entomological Society of America [Vol. X, 



are colored. Pigmentation then commences on the pronotum 

 and after twenty days the pronotum is fully colored. Emergence 

 takes place at the end of from twenty-four to twenty-nine days. 

 In one case emergence started at eight fifty-five in the morning, 

 was completed except for the withdrawing of the genitalia at 

 eleven fifteen, and was fully completed at twelve twenty-five. 

 The adult does not become completely colored for three days 

 after emergence. 



Notes on the Morphology of Larva, H. cBqualis, Last Stage. 

 (Plates XXVIII, XXIX, XXX). 



Head: Cranium (Figs. 5, 6, 7) symmetrical, rectangular, a 

 little broader than long; occipital foramen narrower than the 

 cranium and almost directly posterior, the head reaches slightly 

 further back below than above; ventral surface with genal 

 sutures (Fig. 6) apparent in the posterior portion. Labrum 

 (Fig. 3) very rudimentary and slightly differentiated from the 

 clypeus, not movable. Clypeus firmly united to frons, epistoma 

 not distinct. Epicranial and frontal sutures not visible in 

 living larvae, though slightly visible in moult skins. Antennae 

 (Figs. 5, 6, 7) deeply inserted in the head. Above the dorsal 

 articulation of the mandible, composed of four segments, the 

 first very short, hardly visible externally, the second long 

 cylindrical, the third capitate, a little more than half as long 

 as the second, the fourth very small, cylindrical, the third 

 joint with a sensory pit at the tip near the external margin, and 

 one to three papillae near the apex on the internal margin. 



Mandible (Figs. 5, 6, 7) falciform, acute, with a single 

 rounded tooth on the inner margin. At the base of the internal 

 margin a cluster of setae. 



Maxillae (Fig. 7) connected with hypostoma by a thin 

 membrane. Cardo very small, almost completely concealed; a 

 fiat plate on the external border of the maxilla and fused to 

 the stipes. Stipes, a long tubular segment, densely fringed 

 with hairs on the inner margin, sparsely fringed on the outer 

 margin, with a long tactile seta near the distal end, inserted 

 just above the margin. The stipes are flattened on the dorsal 

 side. Next to the stipes come a stout short segment, less than 

 one-quarter the length of the stipes. It is swollen on the inner 

 side and bears oi;! the swelling a short finger-like segment, 



